When the head of a secret order of priests is found dead, with a strange mark left on his body, another member is sent to investigate. He soon finds himself plunged into a mystery, only to find himself at the heart of it.

After watching her husband and friends fall victim to drug overdoses, Philippa's attempts at involving the authorities have been ill-fated. Now with the unexpected help of a sympathetic police officer, Philippa feels she has nothing to lose by taking justice into her own hands.